If the parsing of the config file fails make sure we unlock ldap_lock.

(closes issue #12477)
Reported by: IgorG


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@114254 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_config_ldap.c

@@ -1364,6 +1364,7 @@ static int reload(void)
 
 	if (parse_config() < 0) {
 		ast_log(LOG_NOTICE, "Cannot reload LDAP RealTime driver.\n");
+		ast_mutex_unlock(&ldap_lock);
 		return 0;
 	}